Thermogravimetric Method Research Articles

Effect of Newly Synthesized Structures of Peptides on the Stability of the Monolayers Formed.

The aim of the study was to evaluate the effect of the peptide structure (WKWK)2-KWKWK-NH2, P4 (C12)2-KKKK-NH2, P5 (KWK)2-KWWW-NH2, P6 (KK)2-KWWW-NH2 on their physicochemical properties. The thermogravimetric method (TG/DTG) was used, which made it possible to observe the course of chemical reactions and phase transformations occurring during the heating of solid samples. Based on the DSC curves, the enthalpy of the processes occurring in the peptides was determined. The influence of the chemical structure of this group of compounds on their film-forming properties was determined using the Langmuir-Wilhelmy trough method and was followed by molecular dynamics simulation. Evaluated peptides showed high thermal stability and the first significant mass loss occurred only at about 230 °C and 350 °C. The analysis of the compressibility coefficient of individual peptides indicates that all formed peptide monolayers were in the expanded liquid phase. Their maximum compressibility factor was less than 50.0 mN/m. Its highest value of 42.7 mN/m was achieved in a monolayer made of P4. The results obtained in molecular dynamic simulation indicate that non-polar side chains played an important role in the properties of the P4 monolayer, and the same applies to P5, except that a spherical effect was observed here. A slightly different behavior was observed for the P6 and P2 peptide systems, where the type of amino acids present had an influence. The obtained results indicate that the structure of the peptide affected its physicochemical and layer-forming properties.

Bio-Graphene Sensors for Monitoring Moisture Levels in Wood and Ambient Environment.

Wood is an inherently hygroscopic material which tends to absorb moisture from its surrounding. Moisture in wood isa determining factor for the quality of wood being employed in construction, since it causes weakening, deformation, rotting, and ultimately leading to failure of the structures resulting in costs to the economy, the environment, and to the safety of residents. Therefore, monitoring moisture in wood during the construction phase and after construction is vital for the future of smart and sustainable buildings. Employing bio-based materials for the construction of electronics is one way to mitigate the environmental impact of such electronics. Herein, a bio-graphene sensor for monitoring the moisture inside and around wooden surfaces is fabricated using laser-induced graphitization of a lignin-based ink precursor. The bio-graphene sensors are used to measure humidity in the range of 10% up to 90% at 25°C. Using laser induced graphitization, conductor resistivity of 18.6 Ω sq-1 is obtained for spruce wood and 57.1 Ω sq-1 for pine wood. The sensitivity of sensors fabricated on spruce and pine wood is 2.6 and 0.74 MΩ per % RH. Surface morphology and degree of graphitization are investigated using scanning electron microscopy, Raman spectroscopy, and thermogravimetric analysis methods.

Investigation on co-combustion behavior and kinetic analysis of bamboo char/waste plastics (PVC) hydrochar

The combustion properties of bamboo char (BC), PVC hydrochar and blends were studied by non-isothermal thermogravimetric method. The high carbon structure order and ash content of BC are the main reasons for its poor combustion performance. Blending with PC can effectively improve its combustion performance, and there is an obvious negative synergistic effect between PC and BC, which is most obvious when the content of PC is 40%. The accuracy of fitting degree of RPM model is better than that of VM model, the activation energies (E) of BC and PC are 102.1 kJ/mol and 60.9 kJ/mol, respectively. Finally, a coupling process of fuel preparation and blast furnace injection was proposed, and the environmental and economic benefits were calculated. The total cost can be reduced by 29.18 CNY/T, carbon emissions can be reduced by 73.16 KG/T, and the maximum proportion of PVC hydrochar is only 40%.

Consideration of a new approach to clarify the mechanism formation of AgNPs, AgNCl and AgNPs@AgNCl synthesized by biological method

The biological methods are considered as environmental-eco-friendly methods for the silver nanocomposites mediation and are widely used in this context. However, the biological methods go along with the relevant limitations, for instance simultaneous synthesis of silver chlorides (AgNCl) type during the AgNPs mediation process. Therefore, the present research is coming to summarize several aspects in this context. Firstly, to present the possible promotion of the sustainable development using bioactive source (e.g. milk) as a source of two different available and new lactobacillus strains (Lactobacillus curvatus and Lactobacillus fermentum). Secondly, to show the ability of the respective isolates to be involved in mediation of various biosilver nanocomposites ((Bio)NCs) synthesis. Moreover, at this stage, for the first time, two (Bio)NCs mediation methods, called “direct method” and “modified method”, have been developed, thus three types (AgNPs, AgNCl and AgNP@AgNCl) of nanocomposites mediated by two different Lactobacillus isolates take place. The interdisciplinary approach included using several spectroscopic, microscopic, spectrometric and thermogravimetric methods demonstrated that all six synthesized nanoparticles (three AgNPs, AgNCl and AgNP@AgNCl types from each source) consist of complex structure including both metallic silver core as well as organic surface deposits. The spectrometric technique allowed to identification of the organics branching surface, naturally secreted by the used Lactobacillus isolates during the inoculation step, suggesting the presence of amino-acids sequences which are direct connected with the reduction of silver ion to metal silver, and subsequently with the formation of coated (Bio)NCs and nucleation process. Moreover, based on the obtained results, the mediation mechanism of each (Bio)NCs has been proposed, suggesting that the formation of AgNPs, AgNCl and AgNP@AgNCl types occurs in different manners with faster synthesis firstly of AgNCl, then of the AgNPs type. No differences between the (Bio)NCs synthesized by two different Lactobacillus isolates have been noticed indicating no discrepancies between metabolites secreted by the respective sources.Graphical abstract

SO3H-functionalized carbon fibers for the catalytic transformation of glycerol to glycerol tert-butyl ethers

Carbon fibers (CFs) of high quality were produced from hydrocarbons such as isobutane or ethylene using the catalytic chemical vapor deposition method (CCVD) and Ni catalyst. The as-prepared samples were functionalized with acidic groups using concentrated sulfuric acid or 4-benzenediazonium sulfonate (BDS) generated in situ from sulfanilic acid and sodium nitrite. The morphological features of the materials were confirmed by transmission electron microscopy, whereas their physicochemical properties were characterized by means of elemental and textural analyses, thermogravimetric (TG) method, Raman spectroscopy, potentiometric back titration, and X-ray diffraction analysis. The obtained CFs were used as catalysts in glycerol etherification with tert-butyl alcohol at 110 °C under autogenous pressure. The BDS-modified CFs were particularly effective in the reaction, showing high glycerol conversions (of about 45–55% after 6 h) and substantial yields of mono- and di-glycerol ethers. It was found that the chemistry of the sample surface was crucial for the process. The high concentration of -SO3H groups decorating CFs boosted the formation of di- and tri-tert-butyl glycerol ethers. Surface oxygen functionalities also had a positive effect on the reaction, however, their impact on the catalytic performances of CFs was significantly weaker compared to that shown by -SO3H groups and it was probably due to the adsorption of reagents on the catalyst surface.

Solid-state synthesis of ZnMn2O4 spinel: Sequence of phase transformations, thermal stability, localization and charge state of manganese ions in the intermediate and final reaction products

This paper presents data on the solid-state synthesis of spinel ZnMn2O4, one of the leading promising materials for numerous practical applications. The evolution of the phase composition and charge state of manganese ions during the solid-state synthesis of ZnMn2O4 in air from ZnO and Mn2O3 has been studied. Using differential thermal, thermogravimetric, and X-ray diffraction analysis methods it has been established that, at a temperature of about 700 °C, an insignificant amount of ZnMn2O4 is present in the mixture with the initial oxides. During further heat treatment ZnMn2O4 interacts with Mn2O3 to form the solid solution based on ZnMn2O4. In parallel with this process, in the temperature range of 800–850 °C, ZnMn2O4 reacts with ZnO to form the compound ZnMn4+O3. It has been shown that heat treatment at 880–1180 °C leads to the formation of the final single-phase product – ZnMn2O4. Using diffuse reflectance spectroscopy, XPS, and FT-IR methods, the charge state and localization of Mn ions in the intermediate and final synthesis products have been determined. It has been shown that in the Zn1-xMn2+xMn3+2O4 solid solution Mn2+ ions are localized in the tetrahedral positions and Mn3+ ions in the octahedral positions of the structure. In the final single-phase product, ZnMn2O4, the tetrahedral positions are occupied only by zinc ions, and the octahedral positions are occupied only by Mn3+ ions. It has been established that ZnMn2O4 is stable up to 1300°С. Upon reaching this temperature, ZnMn2O4 decomposes into ZnO and Zn1-хMn2+хMn3+2O4.

The use of a microcontroller as part of a device for measuring humidity using the thermogravimetric method

The use of a microcontroller as part of a device for measuring humidity using the thermogravimetric method is considered. The main nodes of the device have been designed, in which the microcontroller receives and processes information from them, and also controls these nodes. They use various microcontroller capabilities, including several data transfer interfaces: I2C, SPI, etc. A built-in analog-to-digital converter is used. The power control unit allows you to flexibly set the required heater power in the device. A unit has been created to control the mass of a material sample in the drying chamber of the device, which provides an accurate measurement of the mass of the substance. The temperature control unit allows the microcontroller to evaluate the material drying parameters and select the operating mode of the power regulator. The performance of the designed units was tested. It is noted that they can be used in a device for measuring humidity using the thermogravimetric method under the control of a single microcontroller.

A new approach to study semi-coordination using two 2-methyl-5-nitroimidazole copper(ii) complexes of biological interest as a model system.

Two novel copper(ii) complexes [Cu(2mni)2(H2O)2](NO3)2·2H2O (1) and [Cu(2mni)2(NO3)2] (2), where 2mni is 2-methyl-5-nitroimidazole, were prepared and characterized in the solid state using single-crystal and powder X-ray diffraction analyses, EPR, electronic and vibrational spectroscopies (FTIR and Raman), and thermogravimetric methods. Both products present an elongated distorted octahedral geometry with axial Cu-O bond lengths of 2.606(14) and 2.593(15) Å, indicating semi-coordination. Density functional theory (DFT) calculations at the B3LYP/LANL2DZ theory level were used to study the electronic properties of 1 and 2. The Independent Gradient Model (IGM) was employed to determine the Intrinsic Bond Strength Index (IBSI) of the semi-coordination and to plot δg isosurfaces for the electronic sharing between the metal center and ligands. A moderate to weak antibacterial activity against Escherichia coli cultures was found for 1 with a 50% growth inhibition (GI50) value of 0.25 mmol L-1. To the best of our knowledge, this is the first time that the semi-coordination analysis using IGM was carried out for a copper(ii) complex with axial elongation, finding a good correlation between the bond length and the IBSI, and the study was extended for a series of analogous complexes described in the literature.

Crystal Structure and Properties of Complex Oxides (Nd,Ba)(Co,Fe)O3–δ

The homogeneity ranges and crystal structure of solid solutions of Nd1−x1BaxCo1−y1FeyO3−δ3 composition were detected. Depending on introduced barium concentration Nd1−x1BaxCo1−y1FeyO3−δ3 oxides have been crystallized in the orthorhombically distorted (x = 0.05, sp. gr. Pbnm), cubic (0.6 ≤ x ≤ 0.9, sp. gr. Pm-3m) perovskite structure or double perovskite structure NdBaCo2−x2FexO5+δ5 (0.0 ≤ x ≤ 1.4, sp. gr. P4/mmm). The dependencies of unit cell parameters versus composition of the Nd1−x1BaxCo1−y1FeyO3−δ3 solid solutions were obtained. It is shown that the values of oxygen nonstoichiometry in Nd1−x1BaxCo1−y1FeyO3−δ3, determined by a thermogravimetric method within the temperature range 298–1373 K in air, increased with the raise of barium and cobalt content. Average values of thermal expansion coefficients for the Nd1−x1BaxCo1−y1FeyO3−δ3 oxides (0.8 ≤ x ≤ 0.9 and 0.7 ≤ y ≤ 0.9) visibly increased with temperature from (13.5–14.5) × 10–6 K–1 at 300–700 K up to (23.2–26.2) × 10–6 K–1 at 700–1373 K.

Study of thermophysical properties of polyamide-based nanocomposites filled with iron nanoparticles

A complex of studies was carried out to study the thermal analysis of the chemical composition of components and compositions based on polyamide filled with iron particles. The paper presents thermogravimetric and other analysis methods of the developed polymer nanocomposites.

SYNTHESIS OF COMPLEXES OF Cu(II) AND VO(IV) WITH HYDRAZIDE OF MALEIC AND HYDRAZINEDIACETIC ACID

The work demonstrated that hydrazide of maleic and hydrazine diacetic acid(L-2,2'-(2-(3- carboxyacryloyl)hydrazine-1,1-diil)diacetic acid) forms mononuclear complexes [CuL(H2O)2] and [VОL(H2O)2]. The structure and physical properties of these complex compounds have been studied by IR, UV spectroscopy and thermogravimetric methods of analysis. On the basis of the data obtained, the structure of the complexes was proposed, in which the metal ion is coordinated by two oxygen atoms and one nitrogen atom of the aminodiacetic fragment. In the electronic spectra of the copper complex, there are absorption bands of the transition at ~240 nm (related to charge transfer) and one d-d transition 740 nm. In the electronic spectra of the vanadyl complex, several absorption bands are observed at 300 nm (inflection), ~625 nm (inflection), and 780 nm, which can be attributed to d–d transitions of the VO2+in the low symmetry ligand environment. The five-coordinated structure of the complex is carried out by two oxygen atoms of two water molecules. The EPR spectrum of the polycrystalline [CuL(H2O)2] complex at room temperature indicates a low symmetry of the complex and has three g -factor values: g1=2.30, g2=2.22; g3=2.11. Additionally, a hyperfine structure is observed due to 63.64Cu nuclei (nuclear spin 3/2) with a splitting constant of 80 G.

ОСОБЕННОСТИ ОБЖИГА СОСУДОВ СУРГУТСКОГО ВАРИАНТА КУЛАЙСКОЙ КУЛЬТУРНО-ИСТОРИЧЕСКОЙ ОБЩНОСТИ (ПО ДАННЫМ ТЕРМИЧЕСКОГО АНАЛИЗА)

The Barsova Gora is a unique landscape object where a great number of archaeological sites from the Neolithic to the modern period have been discovered. One of the most studied cultural formations is the Surgut variant of the Kulai cultural-historical community. Pottery firing skills among potters of various archaeological cultures are of particular interest for studying. By the present time on a wide range of archaeological ceramics the thermogravimetric method allowing to receive the data about intensity and quality of firing has been tested. Ceramics from seven sites of Surgut variant of the Kulai cultural-historical community (50 samples in total) served as a source base. According to the results of the ceramics thermogravimetric analysis, all sites can be divided into three groups depending on intensity of firing. Group 1 (two sites) — the pottery of this group was exposed to the most intensive firing compared to the pottery from other sites. This means that the vessels of this group were fired at a higher temperature and/or for a longer time. Group 2 (three sites) — it includes vessels from the sites, which firing intensity is intermediate between the indicators of groups 1 and 3. Group 3 (two sites) — the pottery from the sites of this group has greater porosity, indicating that it was subjected to less intensive firing than the dishes of all other groups. This means that the vessels of this group were fired at a lower temperature than on the other sites and/or for a shorter period of time. The groups highlighted reflect the significant differences between the intensity of firing on different sites. This points to the presence of heterogeneity of firing traditions among the Kulai cultural-historical community potters at different settlements and differentiation of their skills.

КИНЕТИКА ОКИСЛЕНИЯ АЛЮМИНИЕВОГО СПЛАВА АК7 И КОМПОЗИЦИОННОГО МАТЕРИАЛА НА ОСНОВЕ АЛЮМИНИЯ Al–Al2O3 («ОКСИДАЛЬ») В ТВЕРДОМ СОСТОЯНИИ

Corrosion and oxidation of alloys are one of the main reasons why products lose their properties and functions. The use of materials with high resistance to oxidation can be a solution to many problems in the use and operation of modern technologies and equipment in various conditions. Therefore, the study of the interaction of oxygen with metals and alloys, as well as the identification of the patterns of their interaction, has become of great importance recently, due to the need for new materials with special physical and chemical properties, and the widespread use of such materials in va­rious fields of science and technology. Composite materials based on aluminum and various additives to aluminum alloys can become the basis for obtaining special properties. The results of the study of the process of oxidation of the aluminum alloy AK7 and the composite material of the Al-Al2O3 system (Oxidalle) are presented. The need to study the oxidation process of the AK7 alloy and the composite material determines the possibility of their use in oxygen-containing or oxygen-saturated media. Studies of alloys under isothermal conditions were carried out by the thermogravimetric method in air, recording the mass of samples for an hour at a temperature of 623; 773 and 823K. In this case, the increase in the specific gravity of the samples was determined. Oxidation in time was determined depending on the size of the surface of the samples. Based on these data, kinetic oxidation curves were constructed, and the values of the specific increase in the mass of the samples, that is, the AK7 aluminum alloy and the Oxidalle composite material, were determined depending on time and temperature. Because of the research, it was found that the Oxidal composite material has a lower oxidation rate compared to the AK7 alloy, because the value of the activation energy of the oxidation process in «Oxidalle» is higher than that of the aluminum alloy AK7.

The Use of Coke Ash Residue as Power Generating Fuel at Thermal Power Facilities

The aim of the study is to preliminarily estimate the possibility of using coke-ash residue as power generating fuel. Coke-ash residue is obtained in the process of gasifying the Balakhta brown coal from the Kansk–Achinsk coal basin in the technological process of obtaining producer gas used as fuel for boilers. To achieve the formulated aim, a technical and elemental analysis of the fuel was carried out. Using the thermogravimetric method at three different heating rates in air flow, the temperature intervals of the main stages included in the combustion process are established, and typical combustion characteristics are determined. By applying the scanning electron microscopy method, a qualitative analysis of the fuel particle surfaces for the presence of pores, cracks, and channels was carried out. Using the curve crossing method, the coke residue ignition and burnout temperatures were determined. The average ignition and burnout and burnout temperatures were found to be 466°C and 685°C, respectively. Based on the mass loss curve profiles, the percentage reduction in the fuel mass at all stages of the combustion process was determined. Proceeding from the mass variation rate curve profiles, the maximum reaction rate was established for all heating rates. By using differential scanning calorimetry, the endothermic and exothermic effects at different heating rates were established, and the maximum heat flux intensity was determined. The obtained results are recommended to be used in designing the generating devices and systems at thermal power facilities. Coke-ash residue with a calorific value of 15.1 MJ/kg and a volatile matter content of 11.8% can be used as a smokeless power generating fuel.

Thermodynamics of Formation and Disordering of YBaCo2O6-δ Double Perovskite as a Base for Novel Dense Ceramic Membrane Materials.

Differential scanning calorimetry studies of the complex oxide YBaCo2O6-δ (YBC), combined with the literature data, allowed outlining the phase behavior of YBC depending on the oxygen content and temperature between 298 K and 773 K. The oxygen nonstoichiometry of single-phase tetragonal YBC was measured at different temperatures and oxygen partial pressures by both thermogravimetric and flow reactor methods. The defect structure of YBC was analyzed. As a result, the thermodynamic functions (∆Hi○, ∆Si○) of the defect reactions in YBC were determined. Experimental data on the oxygen content and those calculated based on the theoretical model were shown to be in good agreement. Standard enthalpies of formation at 298.15 K (∆Hf○) were obtained for YBC depending on its oxygen content using solution calorimetry. It was found that ∆Hf○ = f(6-δ) function is linear in the range of (6-δ) from 5.018 to 5.406 and that its slope is close to the value of the enthalpy of the quasichemical reaction describing oxygen exchange between the oxide and ambient atmosphere, which confirms the reliability of the suggested defect structure model.

Gliclazide Removal Efficiency of Carbon‐Based Magnetic Materials: Isotherm and Kinetic Studies

AbstractGliclazide, one of the micropollutants that can be detected in water, is widely used in the treatment of type II diabetes patients. In this study, the removal of gliclazide from aqueous solutions with magnetic carbon‐based materials was investigated. Magnetic activated carbon (MAC) and magnetic multiwalled carbon nanotube (MMWCNT) adsorbents were prepared and characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, X‐ray diffraction, and thermogravimetric analysis methods. The effects of various parameters affecting the adsorption process were examined. The adsorption systems were compatible with the Langmuir isotherm model and the pseudo‐second‐order kinetic model. The maximum monolayer adsorption capacities of the MAC adsorbent (298 K) and the MMWCNT (308 K) were 109.20 and 71.59 mg g−1, respectively. According to desorption studies, adsorbents could be regenerated by around 70 % in 6 hours.

Research of combustion of solid fuel mixture based on coals of different degrees of metamorphism in the regions of Yenisei Siberia

THE PURPOSE. Consider the combustion process of two coals of different degrees of metamorphism and their mixtures using thermogravimetric analysis based on the change in mass and the rate of change in mass during the heating of fuels. Determine the main characteristics of fuels and the combustion process (temperature of ignition and burnout of the coke residue). Determine the tendency to slagging of coal mixtures. METHODS. When solving the tasks, the thermogravimetric method (TGA). RESULTS. The article provides a brief overview of the combustion of non-design fuels at thermal power plants. The results of technical and elemental analysis of Chernogorsk bituminous coal and Balakhta brown coal are presented. A technique for determining the ignition temperature and burnout of the coke residue is described. The thermograms of the combustion process of two coals of different degrees of metamorphism and their mixtures are presented. The main characteristics of their combustion have been determined. A qualitative analysis of the surface of fuel particles for the presence of pores and cracks is shown. The calculation of the tendency to slagging of coal mixtures has been carried out. CONCLUSION. Thermogravimetric analysis showed an earlier ignition of the Balakhta brown coal in comparison with the Montenegrin bituminous coal. With an increase in the proportion of Balakhta coal in the coal mixture, the profile of the combustion curves shifts to the region of lower temperatures. The addition of 25% Balakhta coal reduces the ignition temperature of Chernogorsk coal by 16%, with an increase in the proportion of Balakhta coal in the mixture, the ignition temperature does not change. Balakhta coal has a high tendency to slagging furnace walls, in contrast to Chernogorsk coal, therefore, an increase in its mass fraction in the coal mixture increases the tendency to slagging furnace screens.

Microwave‐Induced Synthesis of Pyridine Based Schiff Bases and Their Applications as Efficient Antimicrobial Textile Dyeing Agents: Experimental and Theoretical Approach

AbstractThree new pyridine‐based Schiff bases P‐2IMBT ((Z)‐2‐(((pyridin‐2‐ylmethyl)imino)methyl)benzene‐1,3,5‐triol), P‐3IMBT (Z)‐2‐(((pyridin‐3‐ylmethyl)imino)methyl)benzene‐1,3,5‐triol, and P‐4IMBT 2‐(((pyridin‐4‐ylmethyl)imino)methyl)benzene‐1,3,5‐triol were investigated to see if they could be employed as antimicrobial textile synthetic dyes. Adding the pyridine nucleus to these compounds improves their textile colour and therapeutic potential. Microwave‐assisted synthesis was used to synthesize these molecules, which is highly efficient, safe, cost‐effective, and ecologically benign. NMR, IR, Mass, PXRD, UV‐Vis, DFT calculations, Fluorescence, and thermogravimetric methods were used to describe all of the compounds. In experiments on wool and silk, these positional isomers, P‐2IMBT, P‐3IMBT, and P‐4IMBT, were found to be washable and offered a rich brown hue with good tonal variation. Cotton had to be pre mordanted, and this is likely a one‐of‐a‐kind cotton mordant dye. Further antimicrobial studies suggest that these compounds could be effective antibacterial agents.

Nano Co3O4/NiO catalysts pyrolysis of Cotinus nana bark for bio-oil and biochemicals raw material

Cotinus nana W. W. Smith is a valued landscape shrub and a good afforestation species that is also widely used in the pharmaceutical industry. In this study, the use of Cotinus nana’s bark (CNB) as biofuel and a biochemical under the catalysis of nano-Co3O4/NiO was explored by various thermogravimetric methods and Fourier transform infrared (FTIR) analysis. The bark powder was extracted using a methanol/benzene solution, and then analyzed by FTIR and gas chromatography-mass spectrometry (GC-MS). The results showed that the pyrolysis products of CNB are rich in phenols, alcohols, and biofuels. The Co3O4 and NiO act as nanometal catalysts in the release of pyrolysis gases, accelerating the precipitation of gaseous products. Among them, NiO has the most obvious catalytic effect in the pyrolysis process of the material components. At the same time, in the temperature range of 40 to 850 °C, as the pyrolysis rate of the sample increases, the pyrolysis process becomes more intense. In contrast, the contents of the extracts N,N-diethyl-formamide, butyric acid, and oleic acid are not only widely used in industry, but also play a pivotal role in medicine. Therefore, the bark of Cotinus nana is an excellent plant material for biofuels and biochemicals.

Study of concrete properties based on crushed stone sand mixture and fiber of fly ash of thermal power plants

Abstract The study aims to optimize the composition of the main composite, the components of which, in their joint presence, make it possible to obtain the most significant positive synergistic effect. The authors of this article used the fibers of fly ash from thermal power plants as a finely dispersed component added to the crushed stone sand mixture. The result of the study was a high-strength corrosion-resistant material consisting of a crushed stone sand mixture (CSSM) with the addition of the fibers of fly ash. The authors applied the thermogravimetric and standard methods to study and determine the performance and strength characteristics of the obtained material. The combined effect of a complex organic-mineral modifying additive and the cement with the fibers of fly ash provided a compacted and reinforced structure of cement stone. An optimal binder composition was developed, consisting of cement and fiber of fly ash. The authors of this article examined the physical-mechanical and structural-mechanical properties of a CSSM of fine-grained concrete reinforced with a complex additive of cement, fibers of fly ash, and a superplasticizer. The study also provided technological solutions for manufacturing a functional mixture of fine-grained concrete based on the developed complex organic-mineral additive.